Singer Teddy Geiger Is Transitioning

Geiger announced the news by sharing a photo of the "For You I Will" singer's response to a follower asking, "tell us, why do you look differently lately?"

"Okay…because u asked nicely…I am transitioning," Geiger wrote. "I started talking about it with a couple of my close friends and family about a month ago and it's given me the courage to start the process. I feel like the next step is to tell all y'all. So here, it goes."

The singer-songwriter continued, "Love it or hate [it] this is who I have been for a looooong time. I love u guys. Talk sooooon byeeee."

In addition to working with Mendes, the "These Walls" singer has worked with One Direction, co-writing and producing the band's songs "Little Black Dress" and "Where Do Broken Hearts Go." What's more, the musician acted alongside Emma Stone and Rainn Wilson in 2008's The Rocker.